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Fabrication of Carbon Nanotube High-Frequency Nanoelectronic Biosensor for Sensing in High Ionic Strength Solutions
Published on: July 22, 2013
Real time radiation dosimeters based on vertically aligned multiwall carbon nanotubes and graphene
Maria Funaro1, Maria Sarno, Paolo Ciambelli
1Department of Chemistry and Biology, University of Salerno, Via Ponte Don Melillo, Fisciano (SA), Italy.
Nanotechnology
|January 30, 2013
Summary
New graphene and carbon nanotube detectors offer improved real-time radiation measurement for radiotherapy. These novel ionization chambers (CIs) provide better charge collection, enabling miniaturization and in vivo dosimetry applications.
Area of Science:
- Medical Physics
- Materials Science
- Nanotechnology
Background:
- Ionization chambers (CIs) are crucial for accurate absorbed dose measurements and quality assurance in radiotherapy.
- Conventional CIs face limitations in spatial resolution and in vivo dosimetry due to their size and high bias voltage requirements.
- There is a need for advanced radiation detectors with improved performance and applicability in diverse dosimetry scenarios.
Purpose of the Study:
- To develop and evaluate novel real-time radiation detectors using graphene and multiwall carbon nanotube (MWCNT) electrodes.
- To compare the charge collection efficiency and performance of these nanocarbon-based detectors against conventional materials.
- To assess the potential of these new detectors for miniaturized and in vivo dosimetry in radiotherapy.
Main Methods:
- Fabrication of radiation detectors with electrodes made of graphene or vertically aligned MWCNTs.
- Investigation of charge collection efficiency under varying bias voltages.
- Comparative performance analysis against reference detectors with conventional electrodes.
Main Results:
- Proposed nanocarbon-based dosimeters exhibit excellent linear dose response and superior charge collection compared to reference detectors at standard bias voltage.
- MWCNT-based ionization chambers demonstrate the highest charge collection efficiency, enabling operation at lower and zero bias voltages for in vivo dosimetry.
- Graphene-based ionization chambers show enhanced performance at standard bias but reduced efficiency at lower voltages due to semiconducting properties.
Conclusions:
- Graphene and MWCNT electrodes offer promising alternatives for developing advanced ionization chambers.
- MWCNT-based detectors are particularly suitable for miniaturized and in vivo radiotherapy applications.
- Further research into graphene's behavior at varying bias voltages is warranted for optimizing its dosimetry applications.
